Finding the Fourth Proportional to 1,218,910.55, 1,681,538.27 and 789,329.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218,910.55 : 1,681,538.27 = 789,329.07 : x
2. Step 2: Convert to fraction form
   1,218,910.55/1,681,538.27 = 789,329.07/x
3. Step 3: Cross multiply
   1,218,910.55x = 1,681,538.27 × 789,329.07
4. Step 4: Simplify right side
   1,218,910.55x = 1,327,287,034,881.86
5. Step 5: Solve for x
   x = 1,327,287,034,881.86/1,218,910.55
6. Step 6: Final answer
   x = 1,088,912.59